Ok.  I see this - his % is 57.  So that's pretty far from 90%!  He was also 426 verbal putting him at the 52%.  Again, just missing the CTY cut off.
However, if I understand correctly means that he's performing about mid-range for a 4th grader, but was only a 2nd grader at the time, right?
Still seems like a sound argument for *something* - to which I imagine the school will say (and already has) that their G&T will address.  
He will receive 90 min/2xweek in LA & 60min/1xweek for math of G&T services.  
Sufficient?